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The 40 MHz channels in an 802.11n WLAN are actually two 20 MHz channels that are __________ together.

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Which of the following is true about the frequencies 802.11b uses?


A) 28 total,22 used in Japan and China
B) 14 total,only 11 used in the U.S.
C) 22 total,only 14 used in Europe
D) 52 total,48 usable

E) B) and C)
F) C) and D)

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